On desktop, the Print button on File › Print now renders the document
to PDF, writes it to a fresh wordcraft-print-*.pdf in the OS temp
folder and opens it without blocking the window: in Preview on macOS,
and in the default PDF app on Linux/BSD (xdg-open, gio, ...) and
Windows (via the `open` crate, already in the tree). The user prints
from there through the system print dialog. If no viewer can be
started, the status bar says so and the file is removed. Print files
older than an hour are cleaned up off the UI thread at start-up and
after each print.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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